Be careful, address with leading 0 return false.
Example :
<?php
inet_pton('172.27.1.04'); // return false
inet_pton('172.27.1.4') ;// return the good result
?>
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
inet_pton — 人間が読める形式の IP アドレスを、パックされた in_addr 形式に変換する
この関数は、人間が読める形式の IPv4 あるいは IPv6 (PHP が IPv6 サポートを有効にしてビルドされている場合) のアドレスを 32 ビットあるいは 128 ビットのバイナリ形式に変換します。
ip可読形式の IPv4 アドレスあるいは IPv6 アドレス。
指定した ip を
in_addr 形式で表したものを返します。
構文的に無効な ip
(ドットのない IPv4 アドレスやコロンのない IPv6 アドレスなど)
を指定した場合は false を返します。
例1 inet_pton() の例
<?php
$in_addr = inet_pton('127.0.0.1');
$in6_addr = inet_pton('::1');
?>
Be careful, address with leading 0 return false.
Example :
<?php
inet_pton('172.27.1.04'); // return false
inet_pton('172.27.1.4') ;// return the good result
?>If you want to use the above function you should test for ':' character before '.'. Meaning, you should check if it's an ipv6 address before checking for ipv4.
Why? IPv6 allows this type of notation:
::127.0.0.1
If you check for '.' character you will think this is an ipv4 address and it will fail.It is possible to verify if PHP was compiled with --disable-ipv6 option by AF_INET6 constant.
<?php
if (defined('AF_INET6')) {
echo "PHP was compiled without --disable-ipv6 option";
} else {
echo "PHP was compiled with --disable-ipv6 option";
}
?>Regarding the ::127.0.0.1 notation
It is a very special case that needs not to be handled. This kind of notation is reserved for ipv4-compatible ipv6 address.
For example the notation ::ffff:192.0.2.128 can be easily read as "ipv6 address that maps to ipv4 address 192.0.2.128"
However as RFC says:
https://tools.ietf.org/html/rfc5156#page-2
2.2. IPv4-Mapped Addresses
::FFFF:0:0/96 are the IPv4-mapped addresses [RFC4291]. Addresses
within this block should not appear on the public Internet.
2.3. IPv4-Compatible Addresses
::<ipv4-address>/96 are the IPv4-compatible addresses [RFC4291].
These addresses are deprecated and should not appear on the public
Internet.
This means that you only need to handle this kind of notation if you need to be compatible with private IP'sIf the input string is not a readable IP address, inet_pton() generates an E_WARNING and returns FALSE. The same is true for inet_ntop().
Also, inet_pton() does not recognize netmask notation (e.g: "1.2.3.4/24" or "1:2::3:4/64") in the input string. This differs from how some database systems (like postgreSQL) support IP address types, so if you need that sort of functionality when processing IP addresses in PHP you'll have to write it in yourself.
A rough example:
<?php
// Sample IP addresses
$ipaddr = '1.2.3.4/24'; // IPv4 with /24 netmask
$ipaddr = '1:2::3:4/64'; // IPv6 with /64 netmask
// Strip out the netmask, if there is one.
$cx = strpos($ipaddr, '/');
if ($cx)
{
$subnet = (int)(substr($ipaddr, $cx+1));
$ipaddr = substr($ipaddr, 0, $cx);
}
else $subnet = null; // No netmask present
// Convert address to packed format
$addr = inet_pton($ipaddr);
// Let's display it as hexadecimal format
foreach(str_split($addr) as $char) echo str_pad(dechex(ord($char)), 2, '0', STR_PAD_LEFT);
echo "<br />\n";
// Convert the netmask
if (is_integer($subnet))
{
// Maximum netmask length = same as packed address
$len = 8*strlen($addr);
if ($subnet > $len) $subnet = $len;
// Create a hex expression of the subnet mask
$mask = str_repeat('f', $subnet>>2);
switch($subnet & 3)
{
case 3: $mask .= 'e'; break;
case 2: $mask .= 'c'; break;
case 1: $mask .= '8'; break;
}
$mask = str_pad($mask, $len>>2, '0');
// Packed representation of netmask
$mask = pack('H*', $mask);
}
// Display the netmask as hexadecimal
foreach(str_split($mask) as $char) echo str_pad(dechex(ord($char)), 2, '0', STR_PAD_LEFT);
?>If you are receiving an "Unrecognized address" error for an IPv6 address, it's possible your version of PHP has not been compiled with IPv6 support.
To check, load up phpinfo(); and look to see if "IPv6 Support" is set to "disabled".